BISCO® HT-840 Silicone Foam
Rogers BISCO® HT-840 Silicone Foam is an extra-firm, open-cell silicone foam engineered for demanding gasketing and sealing applications that require high closure force, rugged durability, and long-term performance. With sealing characteristics similar to sponge rubber, HT-840 provides superior compression strength, flame resistance, and resilience in extreme temperatures and harsh environments. Its robust formulation and cellular structure make it ideal for industrial enclosures, electronics, transportation, and aerospace applications.
Applications include: Cold supply chains, gap filling, gasketing and sealing, shock absorption, and vibration management.
- Resistant to UV, Ozone, and extreme temperatures
- Compact cell structure
- Ideal for high-force sealing, enclosure gasketing, and industrial thermal protection systems
- Available in thicknesses from 0.063 in to 0.250 in
| Property | Specification |
| Backing (Carrier) Material | Extra-firm open-cell silicone foam |
| Adhesive Material | High performance acrylic, high temperature silicone PSA, or plain PSA |
| Density (Metric) | 448 kg/m³ |
| Density (Imperial) | 28 lb/ft³ |
| Compression Force Deflection (kPa) | 142 kPa |
| Compression Force Deflection (PSI) | 20.6 psi |
| Compression Set (22 hrs. at 100°C/50%) | 23.7–34.5% |
| Water Absorption | 0.5% (by weight) |
| Thermal Conductivity (K Value) | 0.09 |
| Tensile Strength (kPa) | 414 kPa |
| Tensile Strength (PSI) | 60 psi |
| Elongation at Break | 60% |
| Shielding Effectiveness (Average 300kHz - 2.5GHz) | |
| Product Color | Gray |
| Dielectric Strength | 57 V/mil |
| Volume Resistivity | 10¹⁴ ohm-cm |
| Insulation Resistance | |
| Certifications | UL 94 V-0; meets FMVSS 302, ASTM E162, ASTM E662 |
| Thickness (Imperial) | 0.063-.25" |
| Thickness (Metric) | 1.6-6.35 mm |
| Maximum Operating Temperature (Celsius) | 200°C |
| Maximum Operating Temperature (Fahrenheit) | 392°F |
| Minimum Operating Temperature (Celsius) | -55°C |
| Minimum Operating Temperature (Fahrenheit) | -67°F |
